2
、
Porosity
Porosity
:
Small cavities or holes resulting from gas pockets in weld metal
.
Insufficient shielding gas at welding
arc.
Increase flow of shielding gas at regulator /
flowmeter
and
/
or
prevent
drafts near welding
arc.
Remove spatter from gun nozzle.
Check gas hoses
for
leaks
.
Adjust
nozzle
distance
from
workpiece
.
Hold gun near bead at end of weld until molten
metal solidifies.
Use welding grade shielding gas ;change to
different gas.
Use clean,dry welding wire.
Eliminate pick up of oil or lubricant on
welding wire from feeder or liner.
Remove all grease, oil,moisture,rust,paint,
coatings,and dirt
from work surface before
welding.
Use a more highly deoxidizing welding wire
(contact supplier)
Do
not
extend
wire
too
far
beyond
nozzle
.
Wrong gas
Dirty welding wire
Workpiece dirty
Welding wire extends too far out of
nozzle
Possible Causes
Corrective Actions
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